https://www.cleftstoneworks.com/gallery/shapes
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http://sheldonslate.com/flooring/patterns.php
like this one a lot too!!
Based on the door width, these tiles appear to be 24"x24", 12"x24", and 12"x12".
https://www.marblewarehouse.com/Brazilian-Gray-Montauk-Blue-Cleft-Slate-Pattern-Tile_p_599.htmlhttps://missmustardseed.com/montauk-blue-slate-tile-in-foyer/
https://www.cleftstoneworks.com/gallery/shapes
Q